1) A virus particle is a nucleic acid (DNA, RNA) and is enclosed in a protein shell/coat
2) Viruses can have a double-stranded DNA, double-stranded RNA, single-stranded DNA, or a single-stranded RNA. These are only found in particular viruses. They are also covered in a protein coat so they are not exposed.
3) (pictures at bottom of post)
4) Tobacco Mosaic Virus- infects tomatoes, cucumbers, peppers and tobacco
5) This is a hard topic because the question if a virus is living or nonliving can go either way. Even though there are some great facts on the fact that a virus is nonliving, I think that a virus is a bit more towards the living side because it contains DNA or RNA genetic material. Not only that but they can reproduce ( with the help of a host) which also means they can mutate. In addition, they are made of proteins.
6) Yes there are some beneficial viruses. For example, there are viruses that kills bacteria. ex. phage
3) 
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